The answer is "<span>Maslow's hierarchy".
</span><span> <span>Abraham Maslow presented the theory in 1943 though it was it was fully expressed in 1954 by him in his famous work “Motivation and personality”. It is this </span><span>theory of motivation which hypothesized that within every human being there exist a set of needs that resembles apyramid. I am uploading a picture portraying the pyramid.</span></span>
</span><span> <span>Abraham Maslow presented the theory in 1943 though it was it was fully expressed in 1954 by him in his famous work “Motivation and personality”. It is this </span><span>theory of motivation which hypothesized that within every human being there exist a set of needs that resembles apyramid. I am uploading a picture portraying the pyramid.</span></span>